Bimetal thermometers can be divided into back connection thermometer, bottom connection thermometer and adjustable thermometer according to the needs of installation environment.  Their working principle is based on the principle of solid thermal expansion, welding two pieces of metal sheet with great difference in expansion coefficient.When the temperature changes, the different expansion coefficient results in different expansion and contraction, resulting in the bending deformation of the metal sheet.According to the different deformation, different rotation amount is generated. The rotation amount drives the connected rotating shaft and the indicator needle at the other end to indicate the temperature. Then are they in same price?

The adjustable bimetal thermometer has the functions of both back connection and bottom connection bimetal thermometers,So it's going to cost more than them.What about back connection and bottom connection bimetal thermometers?We have to start with the connection between the meter head and the temperature sensing tube,The head and temperature sensing tube of bottom connection bimetal thermometer are welded with stainless steel casing through the bottom shell and then connected with thread.The back connection bimetal thermometer is directly welded with the bottom shell.Therefore, the cost of bottom connection bimetal thermometer will be higher than back connection one.